EP3398740B1 - Cutting device for cutting an endless tape, in particular a section of a steel or textile cord tape - Google Patents

Description

The invention relates to a cutting device for cutting an endless belt, in particular a steel or textile cord belt, comprising a knife arrangement comprising an upper knife which can be moved via a drive device and an associated fixed fixed lower knife, as well as a conveyor belt connected downstream of the knife arrangement and receiving a cut belt section, with its upper strand extends at an angle to the horizontal, a section of the upper run located in the area of the knife arrangement being adjustable by means of an adjusting device comprising a support component arranged below the upper run and pivotable about an axis between the position running at the angle and a substantially horizontal position.

Such a cutting device is, for example, from DE 10 2007 025 384 B3 known. An endless strip unwound from a roll of strip material is gripped on the leading edge of the strip material with a pair of material pliers of a gripper device, after which the material pliers are withdrawn and take the gripped strip with them. This is pulled through a knife arrangement, which is used to cut off sections of the endless belt. The knife arrangement has a stationary lower knife and an upper knife movable relative to it, which is usually at an angle to the horizontally running lower knife, so that there is a shearing effect when cutting. Immediately behind the knife arrangement, as seen in the direction of passage of the belt, there is a conveyor belt which receives the cut-off belt section. Since, due to the material tongs moving above the conveyor belt, the conveyor belt is slightly lower than the belt material is drawn in or lies in the cutting plane during cutting, an adjustment device is provided to prevent the cut belt from falling onto the conveyor belt and possibly twisting the spatial position of a section of the upper run of the conveyor belt in the area of the knife arrangement can be adjusted. The conveyor belt runs with its upper run at an angle to the horizontal, i.e. somewhat obliquely relative to the horizontal orientation of the cutting edge. With the out DE 10 2007 025 384 B3 Known adjustment device, it is now possible to lift this upper strand section from its obliquely running spatial position, so that it runs essentially horizontally, that is to say the distance between the receiving plane of the upper strand and the cutting plane can be reduced therefrom. For this purpose, the adjusting device has a support component that can be pivoted about an axis, for example a support plate or a support frame. The adjustment of the support component is done in DE 10 2007 025 384 B3 by means of an actuating cylinder which is adjusted hydraulically or pneumatically, that is to say that it is extended in a manner controlled by a fluid pressure or an air pressure in order to raise the support component and retracted in order to lower it. On the one hand, this hydraulic or pneumatic control is relatively slow, since hydraulic fluid or compressed air must be conveyed for the respective actuating movement. This inertia has a disadvantageous effect on the adjustment speed, which in turn has an effect as a limiting factor for the cutting speed or the timing of the individual cuts. In addition, such hydraulic or pneumatic cylinders are not necessarily able to position the support component exactly.

The invention is therefore based on the problem of specifying an improved cutting device.

To solve this problem, it is provided according to the invention in a cutting device of the type mentioned at the outset that both the drive device and the adjusting device comprise a drive motor and a crank drive which can be actuated by the latter.

In the cutting device according to the invention, both the upper knife and the support component can be adjusted via a purely mechanical movement unit. Both the drive device of the upper knife and the adjusting device of the upper run each have a crank drive, which of one drive motor each is driven in the form of an electric motor. This means that the adjustment movement of the upper knife and the support component takes place via a purely mechanical positive coupling to the drive motor that actuates the crank mechanism. Such a crank drive can therefore be used to drive higher speeds after the drive motor operates over a correspondingly wide speed range, which go directly into the movement of the upper knife or the support component via the mechanical connection of the drive motor to the upper knife or the support component. Due to the mechanical connection, there are no losses due to inertia of the actuating element or positioning inaccuracies, especially in the adjusting device, which previously worked pneumatically or hydraulically, after the crank mechanism always performs the same movement and thus always has a constant movement profile.

Overall, the design of the drive device and the adjustment device in the form of an electric drive motor with the drive motor and the upper knife or the supporting component coupling crank mechanism on the one hand enables a very fast operation both on the part of the knife arrangement and the adjustment device, but on the other hand also a very precise positioning, whereby these advantages, in particular on the part of the adjusting device, which previously operated hydraulically or pneumatically, show. The fact that, according to the invention, both the drive device and the adjusting device operate purely mechanically via the electric motor, both are consequently designed in the same way and perform in a comparable manner.

The movements of the upper knife and the support component are preferably synchronized in such a way that the vertical distance of the cutting edge of the upper knife from the surface of the upper strand section is almost the same at every intersection during the cut, so that the cut strip section always has the same distance over the entire cutting length until it is deposited the upper strand section. The distance should be as small as possible.

In a further development of the invention, it is provided that the respective crank drive comprises at least one lever which is movable via the drive motor and a thrust element which is pivotably arranged thereon and which is coupled to the upper knife or the support component. The mechanical coupling, i.e. the crank mechanism, comprises two components, namely a lever which is connected to the drive shaft of the drive motor and a thrust element which is pivotably arranged on the lever and which is coupled at its other end to the upper knife or the support component. A rotation of the drive shaft of the motor leads directly to a lever rotation, which in turn is given directly to the thrust element, and via this directly to the upper knife or the support component. No damping or energy-consuming elements are evidently interposed within this mechanical coupling, so that operation of the drive motor consequently leads directly to a corresponding reaction on the part of the upper knife or the support component.

Since the upper knife can have a width of up to several meters, and since the conveyor belt and the support component assigned to it can also have a corresponding width, it is expedient to couple the upper knife and the support component to the crank mechanism on both sides, which is why the respective drive motor is expediently connected to one the drive shaft extending on either side thereof is coupled or has such a shaft, on each of which a lever with a thrust element is arranged on each side. The upper knife and the support component are consequently coupled to the drive motor on both sides via a corresponding connection mechanism, that is to say they are guided synchronously on both sides.

The drive device can be designed in such a way that the drive motor and thus the lever or levers rotate through 360 ° to make a cut. This means that the drive motor always rotates in one direction to effect the downward and upward movement of the upper knife. A reversal is therefore not mandatory. The adjusting device can also be designed such that the drive motor and thus the lever or levers rotate through 360 °. This is possible if the synchronization between the drive device and the adjustment device ensures that there is no collision between the upper knife and the raised upper run or support component, which is continuously lowered during the cut. Alternatively, it is conceivable that the drive motor of the adjusting device only rotates by an angle <180 °, in particular by approximately 90 °. In this case, the drive motor consequently pivots the lever or levers only by a certain angular range, which is required to ensure the required adjustment movement, that is to say the lifting and lowering of the support component and thus the upper strand, to the required extent. A movement beyond this required dimension does not take place here, that is to say that the lever or levers and thus the thrust element or elements only rotate in certain angular sections or perform only certain linear movements. This can be used to ensure in a simple manner that no collisions will occur under any circumstances.

The push element (s) of the drive device are preferably push rods, although these do not necessarily have to be linear components, they can also be curved components, also in plate form or the like, but in any case inherently rigid components that have a force and Allow torque transmission to the upper knife. The push element (s) of the adjusting device can also be push rods, in which case linear rods are preferably used. Such push rods can be used in particular when the lever is rotated through an angle <180 °, in particular approximately 90 °. In the event that the drive motor and thus the lever or levers rotate through 360 °, it is expedient to provide a safety function against a collision of the upper knife with the support component that occurs in the event of control errors or the like. In this case, a pressure cylinder comprising a pressure relief valve can be provided as a thrust element on the part of the adjusting device. This z. B. designed as a gas pressure cylinder is a rigid, so rigid component that serves as a rigid thrust element in normal operation and immediately Transfers lever movement to the support member. In the event, however, that a collision occurs, the pressure cylinder can give way a little via the pressure relief valve, so that there is no damage on the part of the crank mechanism in the event of a collision.

Geared motors are preferably used as drive motors. These allow a very fast and in particular highly precise movement and positioning of the upper knife and the support component.

As described, the spatial orientation of the upper run can be changed via the adjustment device; it can be adjusted between a quasi-lowered position, which runs obliquely to the horizontal, and a raised, essentially horizontal position. During operation, the upper run is raised to the horizontal position before the actual cut. It is then lowered during the cut, so it practically follows the knife lowering, so that the successively cut band can lay down successively on the lowering upper strand. In order to make this laying movement as homogeneous and uniform as possible over the entire cutting length, so that consequently the successively cut strip material is at almost the same distance from the upper strand at each intersection or falls by almost the same path in the direction of the upper strand, a particularly expedient development of the invention provides that the two crank drives can be operated via the two drive motors in such a way that, at least during the time between the cutting of the upper knife into the band and the end of the cut, the angular speed of the rotating lever or levers of the adjusting device is substantially equal to the angular speed of the rotating lever or rotations of the driving device is. This means that, according to the invention, the two drive motors, which operate in such a way that the levers of the adjusting device and the drive device are set to almost the same angular speeds, that is to say they rotate at almost the same speed. As a result, the knife movement and the movement of the support component are largely synchronized. This in turn leads to the fact that during the lowering movement of the Upper knife during the cut and the simultaneous lowering movement of the support component and thus the upper run in each intersection, the distance of the intersection to the point vertically below on the top of the upper run remains almost the same. During the cut, the point of intersection moves continuously from one side to the other of the edge of the band from the point of incision at which the upper knife dips into the band to the point of exit from the band that has been cut. The upper run is also continuously lowered during this cutting movement. Due to the synchronization of the angular velocities, this lowering movement of the upper run is now largely synchronized with the lowering movement of the cutting knife that, despite the moving intersection, its distance from the underlying vertical surface point of the upper run remains almost the same. This means that the cut piece of tape that descends on the upper run always travels almost the same way and therefore a uniform lowering or falling movement occurs over the entire cutting width. This is particularly expedient as it advantageously precludes any distortion in the cut band piece or the like which may result from the lowering or falling.

The two crank drives and the two drive motors can be operated in such a way that the angular velocities are essentially the same up to the point in time at which the rotating lever (s) of the drive device and the rotating lever (s) of the adjusting device have reached bottom dead center. As described, the cutting knife can have a length of several meters, as must the support component. The bandwidth or the length of the cut, which can also be made at an angle to the longitudinal direction of the band, can inevitably also be several meters long. However, the respective cut is ended in any case when the upper knife has reached its lowest position, which is associated with the same as the bottom dead center of the lever or levers of the drive device. Therefore, it is useful if the angular speeds of the levers of the drive and Adjustment device are almost the same until each bottom dead center is reached.

Since these are separate mechanical drives, a complete identity of the respective angular velocities cannot necessarily be achieved, which may also be due to any geometrical relationships in the area of the respective crank drives. However, the goal is to bring them as close as possible to one another. Therefore, the essentially identical angular velocities should not differ too much from one another. An angular velocity difference should amount to a maximum of 5%, preferably a maximum of 2%, that is to say that a certain speed tolerance range is given, which, however, should be kept as small as possible.

In normal operation, the upper knife starts from the raised position, which is synonymous with the positioning of the crank mechanism of the drive device with the lever or levers at top dead center. An intermittent operation is usually given, which means that the crank mechanism is briefly at top dead center after a 360 ° rotation, after which it turns again to carry out the next cut. By the time the upper knife cuts the tape, the upper knife has to be lowered a bit. This means that the upper knife with the incision has already reached its corresponding lowering speed and thus the lever or levers the corresponding angular speed, which remains constant during the entire cut. In order to ensure that at the time of the incision the adjusting device also has the corresponding angular velocity, which is also constant throughout the cut, it is necessary to accelerate the stationary crank drive of the adjusting device via the drive motor a defined period of time before the cutting of the upper knife, such that that the angular velocity of the rotating lever or levers of the adjusting device at the time of the cut essentially corresponds to the angular speed of the rotating lever or levers of the drive device. This means that the crank mechanism of the adjusting device accelerates in a defined manner before the upper knife is cut so that it has the required angular velocity that is constant and constant during the cut.

In a further development of the invention it can be provided that at least the operation of the drive motor of the adjusting device can be controlled as a function of the detection result of at least one sensor element which provides information relating to the operation of the upper knife and the strip to be cut. This means that the adjustment device virtually follows the knife movement or follows the incoming or positioned strip to be cut. The sensor detects corresponding information, for example that the cutting knife lowers from its raised position or that the lever or levers of the drive device are moved from the top dead center. Alternatively, band-related information can also be recorded. Based on this information, the point in time is now defined at which the drive motor of the adjusting device starts to turn or accelerate the crank mechanism. The sensor element can, of course, also detect the point in time at which the drive motor of the drive device is activated or turns on and use this point in time as a trigger torque.

In addition to the cutting device itself, the invention further relates to a method for operating a cutting device for cutting an endless belt, in particular a steel or textile cord belt, comprising a knife arrangement comprising an upper knife movable via a drive device and a positionally fixed lower knife associated therewith, and one connected downstream of the knife arrangement Cut belt section receiving conveyor belt, which runs with its upper run and an angle to the horizontal, a section of the upper run located in the area of the knife arrangement by means of an adjusting device comprising a support component arranged below the upper run and pivotable about an axis between the position running at the angle and one is essentially horizontal position adjustable, according to the method, both the drive device and the adjusting device comprises a drive motor and a crank mechanism, the respective drive motor driving the respective crank mechanism.

The respective crank mechanism can comprise one or two levers which are movable via the drive motor, eccentrically mounted levers and a thrust element which is pivotably arranged thereon or which are coupled to the upper knife or the supporting component, the drive motor of the drive device and thus the or rotate the levers through 360 ° to perform a cut, and the drive motor of the adjusting device and thus the lever or levers rotate through 360 ° or only through an angle <180 °, in particular approximately 90 °.

It is particularly preferred for synchronization of the knife and the support component movement if the two crank drives are moved via the two drive motors in such a way that at least during the time between the incision of the upper knife in the band and the end of the cut, the angular velocity of the rotating lever or levers Adjusting device is substantially equal to the angular velocity of the rotating lever or levers of the drive device. The motors therefore work in such a way that the levers have the same angular speed or the same speed in order to synchronize the movement of the upper knife and the support component during the cut as far as possible.

Furthermore, it can be provided that the two crank drives are moved via the two drive motors in such a way that the angular velocity up to the point in time at which the rotating lever or levers of the drive device and the rotating lever or levers together reach bottom dead center is equal to.

Although the goal is to set almost identical angular velocities, these may be somewhat tolerant, which can also be attributed to geometrical conditions with regard to the crank drives or the arrangement of the components concerned. The angular velocities should be as equal as possible, the possible deviation should be a maximum of 5%, preferably a maximum of 2%.

Furthermore, it can be provided that the stationary crank drive of the adjusting device is accelerated by the drive motor a defined period of time before the upper knife is cut into the band, so that the angular velocity of the rotating lever or levers of the adjusting device at the time of the cutting essentially corresponds to the angular speed of the or the rotating lever of the drive device corresponds. The crank mechanism of the adjusting device is thus accelerated in a defined manner before the incision, so that almost the same angular velocity is given during the entire cut.

Finally, it can be provided that at least the operation of the drive motor of the adjusting devices is controlled as a function of the detection result of at least one sensor element which provides information relating to the operation of the upper knife or the strip to be cut.

All statements relating to the cutting device according to the invention apply equally to the method according to the invention.

Fig. 1

eine Prinzipdarstellung einer erfindungsgemäßen Schneideinrichtung mit Messeranordnung und Transportband mit angehobenem Obermesser und angehobenem Obertrum,

Fig. 2

die Anordnung aus Fig. 1 mit angehobenem Obertrum und abgesenktem, kurz vor dem Anschnitt befindlichen Obermesser,

Fig. 3

die Anordnung aus Fig. 2 mit abgesenktem Obertrum und nach Durchführung des Schnitts erneut angehobenem Obermessers,

Fig. 4

eine Prinzipdarstellung der Kurbeltriebe der Antriebseinrichtung und der Verstelleinrichtung zu Beginn des Synchronlaufs während des Schnitts,

Fig. 5

eine Prinzipdarstellung entsprechend Fig. 4 im jeweils unteren Totpunkt der Kurbeltriebe am Ende des Synchronlaufs,

Fig. 6 - 9

Prinzipdarstellungen und unterschiedlicher Positionen des Obermessers sowie des Verlaufs der Ausrichtung des Obertrums bezüglich einer Bewegung des Obermessers von der angehobenen in die abgesenkte Stellung, also vom oberen Totpunkt bis zum unteren Totpunkt des Kurbeltriebs der Antriebseinrichtung,

Fig. 10

Diagramme zur Erläuterung des Weg-Zeit-Verhältnisses der beiden Kurbeltriebe hinsichtlich der Rotationsbewegung der jeweiligen Hebel,

Fig. 11

eine Seitenansicht des Antriebsmotors nebst Kurbeltrieb der Verstelleinrichtung im unteren Totpunkt,

Fig. 12

eine Vorderseitenansicht, teilweise geschnitten, der Anordnung aus Fig. 11,

Fig. 13

eine Seitenansicht des Transportbandes nebst Verstelleinrichtung,

Fig. 14

eine Aufsicht auf die Anordnung aus Fig. 13 mit angedeuteter Messeranordnung und zu schneidendem Band,

Fig. 15

eine vereinfachte Draufsicht einer Schneidanlage ohne Slitter, und

Fig. 16

eine vereinfachte Draufsicht einer Schneidanlage mit Slitter.

Further advantages and details of the present invention result from the exemplary embodiments described below. Show:

Fig. 1

2 shows a basic illustration of a cutting device according to the invention with knife arrangement and conveyor belt with raised upper knife and raised upper run,

Fig. 2

the arrangement Fig. 1 with the upper run raised and the upper knife lowered just before the gate,

Fig. 3

the arrangement Fig. 2 with the upper strand lowered and the upper knife raised again after making the cut,

Fig. 4

2 shows a basic illustration of the crank drives of the drive device and of the adjusting device at the beginning of the synchronous operation during the cutting,

Fig. 5

a basic representation accordingly Fig. 4 at the bottom dead center of the crank mechanisms at the end of synchronous operation,

6 - 9

Basic representations and different positions of the upper knife and the course of the alignment of the upper run with respect to a movement of the upper knife from the raised to the lowered position, that is to say from the top dead center to the bottom dead center of the crank mechanism of the drive device,

Fig. 10

Diagrams to explain the travel-time ratio of the two crank drives with regard to the rotational movement of the respective levers,

Fig. 11

a side view of the drive motor together with the crank mechanism of the adjusting device in bottom dead center,

Fig. 12

a front view, partially in section, of the arrangement Fig. 11 .

Fig. 13

a side view of the conveyor belt along with adjusting device,

Fig. 14

supervision of the arrangement Fig. 13 with indicated knife arrangement and band to be cut,

Fig. 15

a simplified top view of a cutting system without slitter, and

Fig. 16

a simplified top view of a cutting system with slitter.

Fig. 1 shows a cutting device 1 according to the invention for cutting an endless belt, in particular a steel or textile cord belt, in a schematic diagram. The cutting device 1 comprises a knife arrangement 2 with a vertically movable upper knife 3 which runs at a slight angle to the horizontal. The knife arrangement 2 further comprises a fixed lower knife 4 which runs horizontally. Between the two knives 3, 4, the endless belt to be cut with the band section to be cut is pulled through a feed device (not shown in detail) comprising, for example, a pulling device, whereupon the cut is made.

A conveyor belt 5 is also provided, which is a circulating belt and which is guided over a plurality of deflection or tensioning rollers. The conveyor belt 5 has, since it runs all the way around, an upper run 6, which runs from its basic orientation at an angle to the horizontal, as shown in the upper run section 6a. The upper strand section 6b, which runs adjacent to the knife arrangement 2, is arranged horizontally in this view, after it can be changed in its spatial orientation by means of an adjusting device which will be described below. The conveyor belt 6 is used to pick up and remove the cut tape section. A drive device 7 is provided for moving the upper knife 3, comprising a drive motor 8 and a crank mechanism 9. The drive motor 8 is connected to a drive shaft 10 extending on both sides thereof, a lever 11 of the crank mechanism 9 being arranged at each end. The levers 11 can be rotated by the drive motor 8 via the drive shaft 10. A push element 12 is arranged on each lever 11, for example in the form of a push rod. The upper knife 2 is then coupled to these thrust elements 12, which is not shown in more detail here. In any case, there is a purely mechanical drive connection from the drive motor 8 to the upper knife 3. The drive motor rotates through 360 ° during operation, so that a defined downward and upward movement during a 360 ° rotation is achieved via the crank mechanism 9, which can also be referred to as a push crank mechanism starting from top dead center, lever 11 is given through bottom dead center and back to top dead center.

As already described, the conveyor belt 6 is assigned an adjusting device 13, comprising a drive motor 14, again preferably a servo motor, and a crank mechanism 15 (thrust crank mechanism) with a lever 16 and a thrust element 17, with a lever on both sides of the drive motor 14 16 and a thrust element 17 is arranged, which will be discussed below.

The thrust elements 17 are connected to a support component 18, which is arranged below the upper strand section 6b and which can be pivoted about a pivot axis 19. The support component 18 can be raised via the crank mechanism 15 during operation of the drive motor, as in FIG Fig. 1 shown where the upper strand section 6b lies in the horizontal or is lowered, so that the upper strand section 6b extends at an angle to the horizontal.

Fig. 1 shows the initial situation before the start of a cut, for example the band section to be cut has just been pulled through the two knives 3, 4. The knife arrangement 2 is thus open, the upper strand section 6b is in the raised, horizontal position.

The drive device 7 or the drive motor 8 is then activated in order to initiate the upper knife movement. Starting from the in Fig. 1 shown position of the lever 11, which are there in the top dead center, they are now rotated out of the top dead center, which leads to the fact that the upper knife 3 is moved downward via the crank mechanism 9, as indicated by the arrow P1 in Fig. 2 shown. The cutting edge of the upper knife 3 shown on the left is in the in Fig. 2 shown position just before the incision in the band, not shown.

At this time, the operating mode of the adjusting device 13 also began, that is to say that the drive motor 14 also started to rotate, so that the crank mechanism 15 is also accelerated. The aim of this acceleration before the start of the actual cut is to ensure that the lowering movement of the support component 18, and thus the upper strand section 6b, which starts when the drive motor 14 is turned on, is synchronized as far as possible with the lowering movement of the upper knife 3 such that during the cut, that is, starting with the cutting of the upper knife 3 into the band, until the end of the cut a synchronous lowering movement of the upper knife 3 and upper strand section 6b is established, whereby by synchronizing the angular speed of the levers 11 and 16 it should be ensured that on the one hand the angular speeds are almost the same, and on the other hand, the distance of the intersection point to the upper side of the upper strand section 6b is almost the same during each cut point.

Fig. 3 then shows the cutting device 1 Fig. 2 after the cut has been made and the upper knife 3 has been brought into the raised position again via the drive device 7, that is to say the two levers 11 are thus again at the top dead center. At this point in time, the upper run section 6b and thus the support component 18 are lowered; the upper run section 6b can be seen to be flush with the upper run section 6a and at an angle to the horizontal.

The Fig. 4 and 5 show two principle representations that represent the mechanical or kinematic relationships. The upper knife 3 is shown, which is shown in the raised position for reasons of clarity. To explain the situation at the time of the cut, the individual relevant edges or planes are shown in the form of the different lines. Line l ₁ represents the course of the lower edge of the upper knife at the time of the incision. Line l ₁ obviously runs at a small angle to the horizontal.

The line l ₂ , which runs horizontally, shows the upper edge of the lower knife, which is fixed in position during the cut. The likewise horizontal line l ₃ in the area of the knife arrangement shows the course of the upper side of the upper strand section 6 b, which can be adjusted in its spatial orientation.

Furthermore, the support component 18 is shown, which can be pivoted about the pivot axis 19 and on which the upper strand section 6b rests.

Also shown is the drive device 7 or its crank mechanism 9 with the respective lever 11 and the thrust element 12, only one lever 11 and one thrust element 12 being shown here. The lever 11 is rotatable about the axis of rotation 20 via the drive motor 8. At this point, there is an indication that the lever 11, of course, rotates perpendicular to the plane of the drawing during operation and the axis of rotation 20 runs parallel to the plane of the drawing.

Also shown is the adjustment device 13 with the crank mechanism 15 comprising the levers 16 and the thrust elements 17, only a lever 16 and a thrust element 17 being shown here as well.

Also shown is a sensor 21 which determines information relating to a specific time of operation, based on which information the adjusting device 13 begins to lower the raised support component 18. The sensor can be, for example, a rotary encoder that detects a rotation of the lever 11, for example from top dead center, or a different type of sensor that detects the position of the incoming belt and the like, for example. Any information from which it can be derived at which point in time the drive motor 14 is to start working can be used.

Fig. 4 shows, as described, the situation at the beginning of the gate, ie exactly at the time when the lower edge l _{1 of} the upper knife 3 is the top of the Tape to be cut. The lever 11 (in the following only one lever 11 together with thrust element 12 is described, of course the second lever and the second thrust element act identically) was moved out of its top dead center OT in order to lower the upper knife 3. At the time of the incision, he takes the position as an example Fig. 4 on.

At this point in time, the drive motor 14 has also turned the crank mechanism 15, the lever 16 (also referred to here as a lever 16 and a thrust element 17) is located in FIG Fig. 4 shown position. It was accelerated in such a way that from now on the angular velocity of the lever 16 is almost identical to the angular velocity of the lever 11, so that from now on the corresponding levers 11, 16 move at the same speed.

The two levers 11, 16 are based on the in Fig. 4 swiveled positions shown then swiveled downward to lower the coupled components and run, see Fig. 5 , in the bottom dead center UT. As can be seen, the lower edge l _{1 of} the upper knife 3 is now below the upper edge l _{2 of} the lower knife, but it still runs at an angle to the horizontal.

As can be seen, the upper side l ₃ of the upper run section 6b now also runs at an angle after the crank mechanism 15 has successively lowered the support component 18 and pivoted it about the axis of rotation 19. How Fig. 5 shows, the lines l ₁ and l _{3 run} almost parallel to each other.

How Fig. 5 shows, the geometry of the respective crank drives 9, 15 has changed, as a result of the respective lever rotation. This led to the respective lowering movement of the upper knife 3 and the support component 18. This respective movement and synchronization of the corresponding lever rotation was carried out, among other things, to ensure that the distance between the lower edge of the upper knife 3 and the upper side of the upper section 6b was related throughout the cut to the respective intersection that is starting of Fig. 4 moves to the right during the continuous cut, always remains almost the same.

In the Fig. 4 and 5 the distance of the lower edge of the upper knife 3 to the upper side of the upper strand section 6b is shown with OB, specifically with respect to the point or the cut line 22 which is shown in FIG Fig. 4 and 5 is shown. This cutting line 22 defines the point at which the upper knife 3 hits the band to be cut for the first time, that is to say the cutting point. The distance is OB, see Fig. 4 , defined at exactly the point via the gate line 22. Because of the oblique course of the lower edge of the upper knife 3 and the horizontal course of the upper run section 6b, the distance OB to the right is evident in Fig. 4 getting bigger.

The gate line 22 is always constant, regardless of how wide the band is. It is defined by an edge that the tape always lies against and does not change.

Due to the synchronized lowering of the upper knife 3 and the support component 18, resulting from the fact that the angular speeds of the levers 11 and 16 during the pivoting movement proceed from Fig. 4 to Fig. 5 As a result, as the cut progresses, during which the point of intersection at which the upper knife and the lower knife interact and cut the strip moves continuously from left to right, the distance OB is almost identical in each individual point of intersection. That is, starting from Fig. 4 the cut line 22 permanently moves to the right as the cut progresses, but the cut line-related distance OB remains almost constant at all times, as a result of the lowering of the upper knife 3 in connection with the synchronized lowering of the support component 18.

In order to make this possible, the crank mechanism 15 must be designed accordingly. The crank mechanism 9 for driving the upper knife 3 is ultimately decisive for the design of the crank mechanism 15 of the adjusting device 13.

Based on the point in time Fig. 4 , ie the time of incision, on the one hand the distance of the cut line 22 to the pivot axis 19 of the support component 18 is known, this distance is indicated by L ₁ in the Fig. 4 and 5 shown. Likewise, the distance L ₂ from the axis of rotation 23, about which the lever 16 is to be rotated, to the pivot axis 19 is known.

The length or the radius R _{1 of} the lever 11 is also known.

wobei gilt:

• R₁ = Radius des Hebels 11
• L₁ = Abstand Schwenkachse 19 zum Anschnittspunkt bzw. Anschnittslinie 22
• R₂ = Radius des Hebels 16
• L₂ = Abstand Schwenkachse 19 zur Drehachse Hebel 16

Assuming the same crank angle, the required radius R ₂ , i.e. the length of the lever 16, can now be calculated as follows: $${\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="imgf0009.png"\; state="\{\{state\}\}">R</figure-callout>}}_2=\left({\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="imgf0004.png,imgf0006.png"\; state="\{\{state\}\}">R</figure-callout>}}_1/{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="imgf0004.png,imgf0006.png"\; state="\{\{state\}\}">L</figure-callout>}}_1\right)\times {\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="imgf0009.png"\; state="\{\{state\}\}">L</figure-callout>}}_2.$$

where:

• R ₁ = radius of the lever 11
• L ₁ = distance of pivot axis 19 to the gate point or gate line 22
• R ₂ = radius of the lever 16
• L ₂ = distance between pivot axis 19 and axis of rotation lever 16

With this simple consideration, the radius or the effective length of the lever 16, which is required to achieve the movement synchronization, can be determined.

The 6 - 9 show in the form of four basic representations the sequence of a cut during a movement of the crank mechanism 9 from the top dead center OT to the bottom dead center UT and, correspondingly, the adjustment of the upper run section 6b.

Shown is the upper blade 3 and the lower knife 4, wherein exemplarily about l ₁ again, the lower edge of the upper blade 3 and the upper edge of l ₂ Lower knife 4 is shown. The course of the upper side of the upper run section 6b is finally indicated by l ₃ .

In Fig. 6 it is assumed that the upper knife 3 is still at rest, that is to say that it is at the top dead center. Obviously there is a large distance OU between the two lower and upper edges l ₁ and l ₂ at the point of the cut line 22, to which the following consideration is based.

In Fig. 6 Furthermore, the distance between the lower edge l _{1 of} the upper knife 3 and the upper side l ₃ of the upper run section 6b is shown with OB and with UB the distance between the upper edge of the lower knife and the upper side l ₃ of the upper run section 6b at the point of the cut line 22.

Fig. 7 shows the situation in which the upper knife 3 is already lowered from its raised position, that is, the crank mechanism 9 has been rotated out of the top dead center. The distance OU clearly decreases. At this time, the adjusting device 13 begins to lower the upper strand section 6b, that is to say that the crank mechanism 15 is turned on. The top l ₃ moves slightly downward, resulting from the rotation of the lever 16.

Fig. 8 shows the situation immediately at the gate. The lower edge l _{1 of} the upper knife 3 and the upper edge l _{2 of} the lower knife 4 interact, the band is cut. This means that at this point in time UB = OB, since the two edges are on the same level, which is why OU = 0 also applies.

With continued movement, the cut is then made across the width. The upper knife 3 is lowered further and cuts through the band. Fig. 9 shows the situation in which the upper knife 3 is completely lowered, that is to say that the lever 11 is at the bottom dead center UT. The upper strand section 6b has been pivoted downward as far as possible, see the course of the upper side l ₃ , the lower edge l _{1 of} the upper knife 3 is clearly below the upper edge l _{2 of} the lower knife 4. Nevertheless, the distance between the lower edge l _{1 and} the upper side l is still ₃ based on the point of intersection defined at that time by the Line 22 is also the same at this position. How Fig. 9 shows the lines l ₁ and l ₃ run parallel to each other.

From this position, the upper knife 3 is then raised again into the in Fig. 6 shown position. After the cut-off band section has been removed, the support component 18 is also raised again, and with it the upper run section 6b.

Fig. 10 shows several diagrams from which the time and speed relationships of the rotation of the respective levers 11 and 16 can be seen.

In the upper part of Fig. 10 the rotation angle range of the lever 11 with the radius R1 is shown on the left. Upper dead center OT and lower dead center UT are given in each case. Also shown is the thrust element 12 and the upper knife 3 indicated. To the right of this is a diagram on which the time t is plotted along the abscissa and the distance S covered by the upper knife 3 is plotted along the ordinate.

In the lower half of the figure, the lever 16 is shown with the radius R2 together with the thrust element 17, and as an example the support component 18.

To the right of this is also a diagram with the distance S covered by the support component 18 over time.

At time t = 0, crank mechanism 9 moves out of top dead center OT. The lever 11 is accelerated slowly, its angular velocity increases. At the same time, see the figure on the right, the moving distance by which the upper knife 3 is lowered increases with increasing acceleration. The distance decreases with constant rotational speed and thus angular speed until it intersects the zero line of the diagram on the right when lever 11 is pivoted by 90 °.

Shortly after this time, the interval t ₁ considered below begins, which extends from this time until bottom dead center UT is reached. The entire swivel angle range between this point and bottom dead center UT is in Fig. 10 shown in the upper left diagram with W ₃ . At the beginning of the interval t ₁ , which is synonymous with the beginning of the swivel angle section W ₂ , in the diagram at the top left in Fig. 10 is shown, the adjusting device 13 also begins its work, that is, the drive motor 14 turns the crank mechanism 15. While the lever 11 continues to pivot, the distance changes, the lever 16 is only accelerated at the beginning of the interval t ₁ , that is to say that the distance covered only increases slowly and only changes at the time t ₂ essentially synchronously with the lever 11.

According to time t ₂ ends Fig. 10 in the diagram shown at the top left, the swivel angle section W ₂ , the swivel angle section W ₁ begins, which is also shown in the associated diagram of the crank mechanism 15 to an identical angular extent. At time t _2, both lever 11 and lever 16 rotate at the same speed, that is to say move at the same angular speed. From this point on, both route changes therefore run almost synchronously with one another until inevitably shortly before bottom dead center UT is reached, where the route change is inevitably zero.

The two diagrams presented opposite show that, due to the same angular velocity of the rotation of the levers 11 and 16 and the corresponding design of the length R2 of the lever 16, the changes in the length of the upper knife 3 and the support component 18 can be synchronized or can be designed in such a way that in each intersection viewed over the length of the cut, the distance between the lower edge l _{1 of} the upper knife 3 and the surface l _{3 of} the upper section 6b does not change, that is to say remains the same.

The fact that the path of the upper knife 3 is shown over a shorter distance S than the entire section than the adjustment device 13, in each case based on the respective crank drive, results from the different lever and travel lengths that are included in the design of the effective length R2 of the lever 16, see the above-mentioned formula.

Z ₁ and Z ₂ indicate the respective stroke of the upper knife 3 and the support component 18. As can be seen, Z ₁ and Z _{2 are the} same in relation to the gate point or the gate line 22.

The 11 and 12 show two representations of the crank mechanism 15 together with the drive motor 14. The crank mechanism 15 comprises two levers 16 connected to the drive shaft 23 in a manner fixed against relative rotation. The drive shaft 23 is connected to the drive motor 14 via a gear 24, the gear being connected to a bracket 25 which in turn is arranged on a fixed component.

On the two levers 16, the two thrust elements 17 are arranged, which are in the 11 and 12 The embodiment shown is two gas cylinders 26, to which a corresponding pressure relief valve 27 is assigned. The two gas cylinders 26 are fastened to the support component 18 with the cylinder piston 28.

In normal operation, the two gas cylinders 26 are completely rigid. So you raise or lower the support member according to the rotation of the lever 16. No length variation of the gas cylinder 26 occurs here. If for whatever reason an undesired collision of the support component 18 with the lowered upper knife 3 occurs during operation, the gas cylinders 26 can yield, that is to say that the pistons 28 move into the cylinder, which can prevent damage.

The levers 16 are designed such that their effective length corresponds to the determined value R2.

The 13 and 14 show a side view of the conveyor belt 6, which is guided over corresponding deflection rollers 29. The rollers are arranged on a corresponding frame construction, which is supported towards the floor via corresponding supports 30.

Also shown is the adjustment device 13 with the drive motor 14 and the crank mechanism 15 and the support component 18 lowered here, for example a frame or a support plate, which can be pivoted about the pivot axis 19. As can be seen, the bracket 25 is fastened to a corresponding frame section.

Fig. 14 shows a top view of the conveyor belt 6. Shown is the knife arrangement 2 and an incoming endless belt 31 which is to be cut with it. Associated with the knife arrangement 2 is a pulling device 32 with which the band 31 can be pulled through the knife arrangement 2. The adjustment device 13 is indicated below the conveyor belt 6 in order to adjust the conveyor belt section 6b in a corresponding manner.

Furthermore, a downstream splicing device 33, on which the cut strip strips 31a are spliced to one another, is only arranged as an example.

The Figures 15 and 16 show different layouts for complete plants. The same system components are also provided with the same reference symbols here. The explanations regarding the functions of the individual system components apply, although given in detail only to one figure, also to all other layout examples described in the figures.

Fig. 15 shows an exemplary layout for a belt system without slitter.

An unwinding station 37 is provided, from which the cord band to be processed is obtained. In the unwinding station 37, the material rolls to be processed are suspended and unwound in a suitable frame. Here, the too processing rubberized cord sheet separated from an intermediate layer (foil, linen or the like). This intermediate layer is used to prevent the rubberized material web from sticking together. In order to implement different cutting angles, the unwinder 37 can be pivoted as described, but this is not absolutely necessary. There are different embodiments with regard to such an unwinder. Single unwinders are known in which a roll of material can be hung. In the case of a double unwinder with a rotary table, two rolls of material are to be hung, one of which is processed, one of which is changed. In addition, a double unwinder with shuttle frame for hanging two rolls of material is known, one is being processed and one is being changed. Furthermore, cassette unwinders are known in which a roll of material is hung in a cassette and the cassette is then transported into the unwinder. This list is not exhaustive. The unwinder can be swiveled.

The unwinding station 37 is followed by a cutting device 1 according to the invention, which is used to cut the cord band coming from the unwinding station. The cutting device is used to cut cord strips in a defined width and angle.

The scissor table serves as material support 38 and is connected to the unwinding station 37 and, if necessary, swivels together with it. The material to be processed lies on the scissor table and is drawn into the cutting device 1 lying thereon. At the beginning of the table or above, there is very often a conveyor which transports the beginning of the material into the scissors, e.g. B. a driven conveyor roller. This is always necessary when the machine is completely empty and the beginning of a new roll of material has to be inserted into the cutting device 1, or if the material has been withdrawn from the cutting device 1 to pivot the unwinder.

The process after cutting is relevant to the design of the cutting device. Additional machine components are used to integrate the cut material into the follow-up process with just a few processing steps (Tapes, brackets, splicers, etc.). For this it is necessary to build as close as possible with these components to the lower knife and in the machine frame. The material should be moved as little as possible (including drop height) so that it can be further processed in the cut storage position.

In order to convey the material through the cutting device 1, the pulling device 32 is used. The pulling device 32 as part of the cutting device 1 serves to convey the material web into the cutting device 1 or pulls the gripped strip through the two knives 3, 4, as previously described. The cutting device 1 also has a conveyor belt which receives the cut cord strip and transports it out of the cutting device 1. Such a conveyor can be designed as a single belt, in the form of several belts or in the form of several belts with an intermediate lifting device.

The cord band strip is then placed on the conveyor belt 6 and fed to a splicing unit 33. The splicer 33 is used to connect (purely mechanically, without the use of additives) the previously cut strip strips. The splicer can be swiveled at an angle in order to be able to process the strip material at different angles.

Optionally, the splicing device 33 can also be followed by a band 47 for manual splicing, that is to say for the manual connection of the band sections. During this manual processing, the automatic splicer 33 is out of operation. Such hand splicing is required for certain cord band materials, very narrow section widths or on customer request.

A calming roller 42 can optionally also be provided. Here, the material undergoes a counter-bending due to the transport via the roller, and the material contracts in the longitudinal direction due to the counter-bending. The background is therefore to reduce the elongation of the material in the longitudinal direction during processing in the splicing device 33. However, this role is not mandatory provided. Furthermore, a repair tape 48 is also provided as an option. If errors are found in the tape, they can be repaired here.

According to Fig. 15 This is followed by a likewise optional covering device 43. In this station, further rubber strips, one to twelve pieces, are placed on the material web produced. It can be put on from above and / or from below. Furthermore, the outer edges of the material web are often bordered, ie a rubber strip is placed on the outer edge with a protrusion and placed around the rubber edge in order to encase the exposed cord threads on the outer edge (= cut edge)

In any case, a winding station 44 is provided. In this station, the material webs that have been made are wound onto spools again with an intermediate layer that prevents sticking. Here, too, there are various embodiments, ranging from simple simple rewinder, in which the material has to be cut manually and rewound on a new roll, to fully automatic rewinder, in which no operator intervention is required for material handling.

Fig. 16 finally shows a system layout for a belt system accordingly Fig. 15 , however, a slitter 50 is also integrated here. The separation of the spliced material web that results from this means that two winding stations 44 must be provided in each case, each of which can optionally be preceded in each case by a covering device 43 and / or a repair belt 48.

Although the conveyor belt is conveyed from right to left in all representations, it is of course possible to lay out the layout in reverse, mirror-image version, i.e. to transport the strip from left to right. All components described as optional can be provided in different combinations together with the essential components. For this reason, different layouts can be created from all the components described.

Claims (18)

1. Cutting installation for cutting an endless tape, in particular a steel or textile cord tape, comprising a blade assembly (2) comprising an upper blade (3) that is movable by way of a drive installation (7) as well as a positionally fixed lower blade (4) that is assigned to said upper blade (3), and a transport belt (5) which is disposed downstream of the blade assembly (2), receives a cut tape portion, and by way of the upper lead (6) of said transport belt (5) runs at an angle to the horizontal, wherein a portion (6b) of the upper lead (6) that is situated in the region of the blade assembly (2), by means of an adjustment installation (13) comprising a support component (18) that is disposed below the upper lead (6) and is pivotable about an axis (19), is adjustable between the position running at an angle and a substantially horizontal position, characterized in that the drive installation (7) as well as the adjustment installation (13) comprise a drive motor (8, 14) and a crank mechanism (7, 15) that is activatable by way of said drive motor (8, 14).
2. Cutting installation according to Claim 1, characterized in that the respective crank mechanism (7, 15) comprises at least one lever (11, 16) that is movable by way of the drive motor (8, 14) as well as a thrust element (12, 17) which is disposed so as to be pivotable on said lever (11, 16) and is coupled to the upper blade (3) or the support component (18), respectively.
3. Cutting installation according to Claim 2, characterized in that the respective drive motor (8, 14) is coupled to a drive shaft (10, 23) that extends to both sides of said respective drive motor (8, 14), one lever (11, 16) having a thrust element (12, 17) being in each case disposed on both sides of said drive shaft (10, 23).
4. Cutting installation according to Claim 2 or 3, characterized in that the drive installation (7) is embodied in such a manner that the drive motor (8) and thus the lever or levers (11) for carrying out a cut rotate by 360°, and in that the adjustment installation (13) is embodied in such a manner that the drive motor (14) and thus the lever or the levers (11) rotate by 360°, or only by an angle <180°, in particular by approximately 90°.
5. Cutting installation according to one of Claims 2 to 4, characterized in that the thrust element or the thrust elements (12) of the drive installation (7) is/are a thrust bar, and in that the thrust element or the thrust elements (17) of the adjustment installation (13) is/are thrust bars or a pressure cylinder (25).
6. Cutting installation according to one of the preceding claims, characterized in that the drive motor (14) of the adjustment installation (13) is a servomotor.
7. Cutting installation according to one of Claims 2 to 6, characterized in that the two crank mechanisms (9, 15) by way of the two drive motors (8, 14) are capable of being operated in such a manner that the angular speed of the rotating lever or levers (16) of the adjustment installation (13) at least during the time between the upper blade (3) cutting into the tape and the end of the cut is substantially identical to the angular speed of the rotating lever or levers (11) of the drive installation (7).
8. Cutting installation according to Claim 7, characterized in that the two crank mechanisms (9, 15) by way of the two drive motors (8, 14) are capable of being operated in such a manner that the angular speeds is substantially identical up to the point in time at which the rotating lever or levers (11) of the drive installation (7) and the rotating lever or levers (16) of the adjustment installation (13) collectively reach the lower dead centre.
9. Cutting installation according to Claim 7 or 8, characterized in that the angular speeds deviate from one another by at most 5%, in particular by at most 2%.
10. Cutting installation according to one of Claims 7 to 9, characterized in that, a defined temporal interval prior to the upper blade (3) cutting into the tape, the resting crank mechanism of the adjustment installation (13) by way of the drive motor (14) is capable of being accelerated in such a manner that the angular speed of the rotating lever or levers (16) of the adjustment installation (13) at the point in time of cutting corresponds substantially to the angular speed of the rotating lever or levers (11) of the drive installation (7).
11. Cutting installation according to one of the preceding claims, characterized in that at least the operation of the drive motor (14) of the adjustment installation (13) is capable of being controlled as a function of the detected result of at least one sensor element which supplies an item of information pertaining to the moving operation of the upper blade (3) or of the tape to be cut.
12. Method for operating a cutting installation for cutting an endless tape, in particular a steel or textile cord tape, comprising a blade assembly (2) comprising an upper blade (3) that is movable by way of a drive installation (7) as well as a positionally fixed lower blade (4) that is assigned to said upper blade (3), and a transport belt (5) which is disposed downstream of the blade assembly (2), receives a cut tape portion, and by way of the upper lead (6) of said transport belt (5) runs at an angle to the horizontal, wherein a portion (6b) of the upper lead (6) that is situated in the region of the blade assembly (2), by means of an adjustment installation (13) comprising a support component (18) that is disposed below the upper lead (6) and is pivotable about an axis (19), is adjustable between the position running at an angle and a substantially horizontal position, characterized in that the drive installation (7) as well as the adjustment installation (13) comprise a drive motor (8, 14) and a crank mechanism (7, 15), wherein the respective drive motor (8, 14) drives the respective crank mechanism (7, 15).
13. Method according to Claim 12, characterized in that the respective crank mechanism comprises one or two eccentrically mounted levers that are movable by way of the drive motor, as well as a respective thrust element which is/are disposed on said lever or levers in a pivotable manner and is/are coupled to the upper blade or the support component, respectively, wherein the drive motor of the drive installation and thus the lever or the levers for carrying out a cut rotate by 360°, and wherein the drive motor of the adjustment device and thus the lever or the levers rotate by 360°, or only by an angle <180°, in particular by approximately 90°.
14. Method according to Claim 13, characterized in that the two crank mechanisms by way of the two drive motors are moved in such a manner that the angular speed of the rotating lever or levers of the adjustment installation, at least during the time between the upper blade cutting into the tape and the end of the cut is substantially identical to the angular speed of the rotating lever or levers of the drive installation.
15. Method according to Claim 14, characterized in that the two crank mechanisms by way of the two drive motors are moved in such a manner that the angular speed is substantially identical up to the point in time at which the rotating lever or levers of the drive installation and the rotating lever or levers of the adjustment installation collectively reach the lower dead centre.
16. Method according to Claim 14 or 15, characterized in that the angular speeds deviate from one another by at most 5%, preferably by at most 2%.
17. Method according to one of Claims 14 to 16, characterized in that, a defined temporal interval prior to the upper blade cutting into the tape, the resting crank mechanism of the adjustment installation by way of the drive motor is accelerated such that the angular speed of the rotating lever or levers of the adjustment installation at the point in time of cutting corresponds substantially to the angular speed of the lever or the levers of the rotating drive installation.
18. Method according to one of Claims 12 to 17, characterized in that at least the operation of the drive motor of the adjustment installation is controlled as a function of the detected result of at least one sensor element which supplies an item of information pertaining to the moving operation of the upper blade or of the tape to be cut.

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